The revised abstract is as follows:As a new waterproof system with plastic in underground silos, three kinds of polypropylene plastic welds were designed and subjected to a water-pressure resistance test in pump-pressure mode. The failure modes, stress processes, failure mechanisms, and influencing factors of different weld forms with different thicknesses were studied. The water-pressure resistance on the groove-weld specimens with welded cover plates was increased by approximately 40%-85% compared with that of the groove-weld specimens. The water-pressure resistance for groove-weld specimens with pasted and welded cover plates was increased by approximately 10% compared with that of the groove-weld specimens with welded cover plates. The depth of the designed underground silos is generally lower than 35 m, and the 8-mm plate thickness and groove-weld specimens with welded cover plate combination can resist 58.16 m of water pressure with a recommended safety factor of 1.66.
GIS technology can be used to support spatial data collection, management, processing, analysis, modeling and display to solve complex planning and manage problems. [2,3] Plot ratio is an important indicator in the reasonable development and utilization. City land suitability evaluation is the basis of urban land development direction. [1] This paper using superposition analysis module and spatial analysis extension module in ARCGIS10.1 software to volume rate statistics, carry out the city land suitability evaluation, and make the results visualization.
This paper introduced general methods of the GPS technology for open-air side slope deformation monitoring,and the entire process of the GPS deformation monitoring through the lead zinc ore open-air side slope in Yinshan,Dexing city, Jiangxi Province including technology design of monitoring network,field survey,data processing and deformation analysis.The results indicate that GPS static positioning technology reached the precision of mini-meter,has good advantages in the open-air side slope deformation monitoring and fully meet the requirements of high-precision deformation monitoring.
Based on the basic theory of 3D expression of geographic elements and the concept, research framework and logic component of 3D map, the dynamic extension of Bergins visual variables in 3D visualization and the designing of 3D cartographic symbol are studied, to systematically analyze the 3D symbolic expression of geographic elements considering the terrain at different scales in 3D space by referring to the traditional cartographic expression theories and combining the characteristics of 3D environment. Then, the levels of detail in 3D point-shaped symbols and the deal of the relationship between point-shaped symbols and terrain model or other elements are discussed in the process of studying expression of point-shaped geographic elements in 3D space. Besides, the line-shaped elements are categorized into three types of elements, which are single-river, boundary and road, to study their symbolized expression based on terrain model in 3D environment respectively, and the multiple expression approach of the road at different scales is discussed emphatically in this part. Finally, the 3D expression of vegetation, soil and water treated as area elements is discussed respectively, according to geographic meaning and 3D modeling approaches of cartographic elements.
By analyzing the attributes of three-dimensional space data model, the integrated 3D spatial data adopts object-oriented method for digital landslide modeling. It achieves spatial data modeling for landslide geological entity. An experimental case is given to indicate the feasibility of this approach for spatial data modeling.
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